PHOTO-ACTIVATED METAL CARBONYL COMPLEXES AS STEREOSELECTIVE CATALYSTS FOR THE HOMOGENEOUS HYDROGENATION OF DIENES.

被引：0

作者：

Heldal, J.A. ^{[1
]}

Frankel, E.N. ^{[1
]}

机构：

[1] USDA, Northern Regional Research, Cent, Peoria, IL, USA, USDA, Northern Regional Research Cent, Peoria, IL, USA

来源：

| 1600年 / 62期

关键词：

CATALYSTS - Chromium Carbonyl Complexes - FATTY ACIDS - Chemical Reactions - ORGANIC COMPOUNDS - Chemistry - ULTRAVIOLET RADIATION;

D O I：

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摘要：

Significantly increased activity of Cr(CO)//6 was achieved for the stereoselective homogeneous hydrogenation of methyl sorbate and trans,trans-conjugated fatty esters at ambient temperature and pressure by exposing the catalyst to UV irradiation (3500 A) in a solvent mixture of cyclohexane-acetonitrile (20:1). In this solvent mixture, methyl sorbate was converted quantitatively at ambient conditions into methyl cis-3-hexenoate, and methyl trans-9,trans-11-octadecadienoate into methyl cis-10-octadecenoate (99. 9%). These products are expected by 1,4-addition of hydrogen. A hydrogenation mechanism is proposed for Cr(CO)//6 that involves CH//3CN- and H//2-Cr(CO)//3 complexes as intermediates for the stereoselective 1,4-addition of hydrogen to trans,trans-conjugated dienes.

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